Locomotive smokestack



June 4, 1940. 0, wo 2,203,317

LoCoMoTIvE SMOKESTACK Filed Jan. 20, 193B Patented June 4, 1940 UNITED STATES PATENT OFFICE Oscar E. Wolden, Minneapolis, Minn yassignor to Locomotive Firebox Company, Chicago, 111.,

a corporation of Delaware Application January 20, 1938, SerialNo.l85,855

3 Claims.

This invention relates to improvements in locomotive smokestacks and it consists of the matters hereinafter described and more particularly pointed out in the appended'claims. The word stack as used herein, is intended to mean not only the barrel of the conventional stack, but also all parts which are directly or otherwise operatively connected to the bottom end of the barrel, such asthe inside stack extension, lift pipe and petticoat pipe, regardless of their particular shapes.

Smokestacksfor locomotives are subject to wear, due to cinder abrasion as the products of combustion. pass up the stack for discharge to the atmosphere under the action of the-exhaust nozzle. Such wear often localizes itself at one point in the stack to produce a hole therein which seriously interferes with draft action.

' When the stack forms apart of a locomotive that includes a centrifugal spark .arrester, the centrifugal action of the products of. com-bustion as they leave the arrester, is carried on in the stack so thatthe abrasive action before mentionedis accelerated, necessitating more frequent stack repair or the provision of a new stack. This, of course, takes the locomotive out of service, which is something to be avoided, if

. possible.

One of the objects of the invention is to provide 'a liner within the stack, which takes the wear produced by the abrasive action of the products of combustion, from the stack.

Another object of the invention is to provide a liner forthis. purpose, which may not only be easily and quickly applied to the stack, but which is so simple as to have but a low initial cost as well as a low installation cost.

A further object of the'invention is to pro. vide a liner for this purpose, which is made in sections readily removed and applied so that should one section become worn to a point requiring renewal, it may be readily removed and replaced by a new one without removing the others from their place in the liner assembly.

Again, it is an object of the invention to provide simple and novel liners for locomotive smokestacks whereby the sections thereof may be made in sets,'with the sections throughout Fig. 2 is a top plan view of the parts appearing in Fig. 1.

1 the line 3'3 of Fig. 1.

Fig. 4 is another horizontal detail fragmentary later.

Fig. 4 is a horizontal. detail fragmentary sec-1 tional-view on an enlarged scale, through a part of lI-hB'llYlDlOVGd. stack construction, as taken on tion and which will also be more fully referred to Referring now in detail to that embodiment of the invention appearingin Figs. 1, 2 and 3 of the accompanying drawing, l0 indicates the barrel of a conventionallocomotive smokestack.

'Said barrel as shown herein is provided at a point between its-top and bottom ends with: an integral, outwardly extending, base-like flange an opening I3. extends into the interior of said smoke box.

:As best shown in Fig. '1, the bottom end of the barrel may have associated therewith-a stack extension I land a lift pipe l5. Said bottom end of the barrel and; a part :of the stack extension have the ;usual laterally'extending flanges I6 and "H respectively to-receive the bolts (not .pluralityof arcuate sections, the number of sets of sections, of course, depending upon the length of that part of the stack with which the set or sets of sections is orv are associated.- As shown in Fig 1, that part of the liner or lining associated with the barrel in is made up This flange is adapted for engagement upon the top portion 12 of a smoke box shell about The bottom end of the barrel .3 shown). for securing the extension to the barrel.

of two sets of liner sections 2il-2l respectively, v

that part of the liner associated with the stack extension l4 ismade up of oneset of liner sections 22 and that'part of the liner associated with the lift pipe i5 is made up of two sets of liner sections 23 and. 24 respectively. The liner sections in each set are of an arcuate' cross section so that whenarranged in position with their side edges substantially in engagement, they extend completely around the inside of the stack.

In the case of the liner sections 2ll--2l, the

liner sections 24 flaring outwardly to fit the in terior of the flared bottom end of the lift pipe.

Preferably the liner sections are made of a relatively' hard metal to present resistance to wear under the abrasive action of the solids in the products of combustion as the same pass upwardly through the stack.

As to the number of sections in each set there of, three sections are quite practical as this makes them relatively small for convenient handling and assembly in the stack. To secure the sections of each set in place, a plurality of longitudinally spaced holes 25 is provided in each section at points between the side edges thereof. Holes 26 are then provided in the stack barrel, stack extension and lift pipe respectively so as to register with the holes in the various associated liner sections. A key bolt 2'! is then inserted through the registering holes from. within the stack and then wedge keys 28 are driven through the key ways in the projecting ends of the bolts from outside the parts of the stack.

When the liners are employed in the stack of a locomotive having a centrifugal spark arrester in its smoke box, it is desired that said liner sections be so formed as to oppose the swirling action of the products of combustion as they pass up the stack. One convenient way to oppose said swirling action is to provide a vane section 29 on each section of the liner. When the liner sections are made of sheet metal, the vanes are likewise made of sheet metal and may be welded along one margin to the associated liner section as at 38 in Fig. 3. When such liner vanes are used, it is preferable that they have a curved cross sectional shape formation as best appears in Figs. 2 and 3. With such a formation the products of combustion are directed inwardly away from the liner sections, into the vortex of the swirling blast passing upthe stack for entrainment.

In Fig. 4, I have illustrated a slightly modified form of liner section wherein the longitudinal margin of one section overlaps the other longitudinal margin of the next adjacent section. To provide this overlapping arrangement, one margin 3| of each liner section is offset inwardly a distance slightly more than the thickness of th metal of the other margin.

In Fig. 5 is illustrated a construction embodying both the vane feature and the overlapping feature in a single section. Such a section is preferably made as an integral structure to include the body 32 ofthe section, the vane 33 and the offset marginal part 34.

In assembling the liner as a whole in the stack parts as shown in Fig. 1, any one of several procedures may be carried out. One Way is first to apply the sections 22 to the stack extension and secure them in place by the associated keybolts and wedge pins. The sections 23 and 24 may then 'be applied from the bottom end of the lift pipe and secured in place by the associated keybolts and wedge pins. Thereafter the sections 2| are applied from the top end of the stack barrel and keybolted in place, after which the sections 20 are applied in a similar manner.

It is apparent from the above that the entire internal surface of the smokestack as a whole, as shown in Fig. 1, is lined or covered with a material which protects the parts of the stack from the abrasive action of the products of combustion discharged up the stack. Should an inspection of the liner disclose that one or more of the sections in any set thereof is worn through,"it is only necessary to remove the wedge'pins 28 associated with that section and drive out the key 2 bolts 21 thereof.

The worn liner section may then be reached from the most convenient end of the stack as a whole, for removal when a new liner section may be substituted therefor, after which the key bolts and locking wedges are replaced;

It is pointed out that the bolt receiving holes in the liner sections'are made to taper toward the outside of the respective section and that the' head of the bolts 2! is of such character as to fit the taper of its holein the sections. Thus the end surface of the heads of the bolts is flush with the internal surface of the liner sections and is protected against abrasive wear.

While in describing the invention, I have referred in detail to the form, construction and relative arrangement of the various liner sections as well as one manner by which they can be assembled in place in the stack as a whole, the same is to be considered only in the illustrative sense, and therefore I do not wish to be limited thereto except as may be specifically set forth in the appendently of its companion sections directly to said stack, and means accessible from outside the stack for locking the securing means to fasten the sections in operative position.

2. In combination-with a stack forthe discharge of the products of combustion from the smoke box of a locomotive boiler, which stack comprises a stack barrel, a stack "extension and a lift 'pipe, respectively connected together, a liner for the stack comprising a plurality of liner sections, means for detachably securing each liner section to said barrel, said extension and lift pipe, respectively, said detachable securing means extending through both said liner and said stack, andlocking means accessible from the outside of the stack for cooperation with said securing means. I I

3. In combination with a stack for the discharge of the products of combustion from the smoke box 'of a locomotive boiler, which stack comprises a stack barrel, a stack extension and a lift pipe, respectively connected together, a

liner for the stack comprising a plurality of liner 

